(1):
(v. t.) To throw out or reject as false or ungrounded; - said of a bill rejected by a grand jury for want of evidence. See Ignoramus.
(2):
(v. t.) Hence: To refuse to take notice of; to shut the eyes to; not to recognize; to disregard willfully and causelessly; as, to ignore certain facts; to ignore the presence of an objectionable person.
(3):
(v. t.) To be ignorant of or not acquainted with.